Improved rock-drill



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'Lenen Patat Na 92,014, dated June 29, 1869.

11i/nazomer: :inox-DRILL.

The Scliedule referred in these Letters Patent 'and makingrpart: of the name. l

To all whom it may concern Be it known that I, GEORGE F. CASE, of the city, county, and State of New York, have invented a new and useful Improvement 'lu Drillsf'or Boring Rock; and l do hereby declare that the following is a tull and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon. f

Figure 1 is a perspective view of asection of the machine with. the drill-rod removed.

Figure 2 is a plan with the frame removed. Figure 3 is a cross-section through the line b b of Figure 4-is a longitudinal section of the drill-head, collar, and portion of the drill-rod.

Figure 5 is an end view of drill-head.

Figure 6 is a cross-section of thedrill-rod, through the line a n ot iig. 4.

The same letters of reference refer to like parts in each figure.

lo enable others skilled in the art to make and use my invention .T will proceed to describe its construe tion'and operation.V

The drill-head is made ot' any suitable metal, and constructed in any form adapted to the object in view.

The diamonds or stones S S are firmly set-'iu the drill-head, iniscellaneously over its lface, but are so adjusted that the entire rock is out away, in space equal to the dimension of the drill-head.

- The drill-rod b is hollow, and when in operation, a

current ot' water is passed through the rod, and out at lr fr, tig. 4, serving the-twofold purpose ot cooling the diamonds and washing out the rock as it is cut away.

. The water and washings escape at fr 1', tig. 2.

A loose collar, C C, is placed upon the drill-head, as

shown in tigs. 2 and 4, the collar being'ot' size fitted' tofill the hole cut by the drill, and pass down within it, and may be of such convenient length as will adapt it to the dimensions 'of' the drill-heat The drill-rod has a longitudinal groove, p, on either side, into which lit the small projections or keys x x, tig. 3, asthe rod is put through the nut d preparatory to operation. Y

'.lhe drill-rod is acted upon by the nut d, which, working in the thread in the drill-rod, moves forward the rod as the rook is cnt away by the drill.

The nut d is claspedby the friction-band E, and by it is held more or less firmly when in operation.

The degree of friction applied through the band E is regulated by the action of the level' F.

The end of the friction-band. E is secured tothe lever F, and the lever itself' is regulated by the screwrod, which passes through the standard G.

The screw-rod is adjusted by the nut h.

Between the nut h and the standard G r is a spiral spring. The action of the spring, when the nut h is turned, causes an extension of the rofl toward the lever F, therebyy pushingl forward the extreme end of by impelled tbrward, and the cutting-process of the.

drill augmented.

The standard G and friction-band E are supported and held in position by an arm, y, projected from the shaft z, a collar, g1, with keys, which fit into the longitudinal grooves r r inthe drill-rod, and Whenever it is set in motionv by a propelling-power, the drill-rod is carried in rotation with it.

The operation of my machine is simple.

The drill-rod is adjusted to its place, and force applied to the collar x, which is thereby given a rotary motion, and the rod moving with it, forces the drillhead against the rock.

The rate of descent ot' the drill-rod is regulated by the friction-baud E. To increase thespeed, this is tightened.A To lessen it, the band is loosened.

A stream of water, by any suitable manner ot' application, is passed through the drill-rod, coming out through the drill-head, cooling the. diamonds, and

washing out, through the grooves in the' guide C, the rock-cuttings.

The drill-head is guided by the collar C, and held rigidly to a direct line. llhe drill-head rotates in the guide, and cannot deflect in any direction.

Power is applied to the propulsion of the drill in any convenient and practical manner.

The advantage of my improvement is obvious. It works with greatfacility, cutting the rock clean. The

diamonds or stones usedare practically indestructible.- This drill exceeds all others in durability, in the' amount of workj it is capable of pertbruiing, and in the facility with which it is worked.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of the drill-rod b with the sleeve or collar x, uut d,- and friction-band E, substantial! y. as shown.

2. The friction-band E, lever F, standard. G, and

nut h, with connections, in combination with the friction-wheel d, when arranged substantially as shown and for the purpose specitied.

3. The shaft '2, in combination with the sleeve x and drill-rod b, and friction-wheel or baud, as and for the purpose specified.

4. Theloose collar C, with or without grooves, when placed upon the drill-head, as Aand for the purpose specified. A

yGEORGE F. OASE. Witnesses:

GEORGE B. MARINS, SANFORD T. lonsnor. 

